PROBLEM TO BE SOLVED: To miniaturize processing facilities by installing a high-electrical-conductance liquid waste condensation device steam condenser at a higher position than a low- electrical-conductance liquid waste collection tank, by transferring distilled water being distilled and treated by a high-electrical-conductance liquid waste condensation device to the low-electrical-conductance liquid waste collection tank by gravity flow, and by performing demineralizing treatment. SOLUTION: Equipment drain, floor drain, and chemical drain being generated in a power plant are received by an equipment drain sump tank 1, a floor drain sump tank 9, and a chemical drain sump tank 12. As the pretreatment of the chemical drain, collection from the chemical drain sump tank 12 to a high-electrical-conductance liquid waste(HCW) collection tank 14 is performed by a chemical drain sump pump 13, and distillation treatment is made by an HCW transfer pump 15 in HCW condensation means 16-20. Distilled water is transferred by gravity flow from the HCW condensation device steam condenser 20 to a low-electrical-conductance liquid waste(LCW) collection tank 3. The distilled water of the equipment drain, the floor drain, and the chemical drain is mixed in the tank 3, solid content is filtered and separated in the case of high electric conductance, and demineralizing treatment is made by an LCW demineralizing device 6.
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